Tanner Lehman watched his son fall through a guard rail Saturday at the St. Cloud Municipal Athletic Complex, where he says a protective plexiglass barrier was missing.

An ambulance took the 6-year-old boy to St. Cloud Hospital, where he was diagnosed with a concussion Saturday afternoon, Lehman said. The Herman, Minn., man was at the State Peewee and Bantam B Hockey Tournament in the Dave Torrey Arena.

Lehman went to pick up his son after the fall near the players bench, and he noticed a panel of plexiglass set off to the side.

"It wasn't in place at all," he said. "There wasn't caution tape."

Children often push and pull on the plexiglass barriers at the MAC, said Operations Director Todd Bissett.

"Kids, they're just relentless on this building," Bissett said. "Parents don't watch their kids when they come to the rink."